Reactive Metals Such as Iron Will Reduce Arsenic Acid (H₃AsO₄)

question 63

Multiple Choice

Reactive metals such as iron will reduce arsenic acid (H₃AsO₄) to the highly poisonous arsine gas (AsH₃) in the presence of acid. What mass of iron would be required for such a reaction with 250 mL of 0.90 M arsenic acid, assuming that the iron is oxidized to Fe³⁺? 3 H₃AsO₄ + 8 Fe + 24 H⁺ → 3 AsH₃ + 12 H₂O + 8 Fe³⁺

• A) 45 g
• B) 38 g
• C) 34 g
• D) 21 g
• E) 13 g

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